Fast-evolving COVID variants complicate vaccine updates

Fast-evolving COVID variants complicate vaccine updates

Vaccines might become more effective if they target newer variants of the SARS-CoV-2 virus, not just the original one.Credit: Joseph Prezioso/AFP/Getty As countries brace for another Omicron wave driven by the variants BA.4 and BA.5, calls to update COVID-19 vaccines are growing louder. Existing vaccines based on the version of the virus SARS-CoV-2 that emerged …

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